Written by

Susan Bloom
| Correspondent

Thanks to longer life spans and the aging baby boomer generation, the U.S. Census Bureau predicts that the numbers of Americans over age 65 will double to 72 million within the next 25 years, reaching 20 percent of the total population by 2030.

Statistics show that there are nearly 2 million Americans currently in their 90s - three times as many as there were in 1980 and a number that's projected to reach 9 million by 2050.

"There are many modifying factors that contribute to long life, including diet, exercise, education level and financial status," said Dr. Sanjiv Sharma, a board-certified ...